feat: 1. replace black with ruff for fomatting and sort import (#489)

2. use tavily from`langchain-tavily` rather than the older one from `langchain-community`

Co-authored-by: Willem Jiang <willem.jiang@gmail.com>

src/tools/python_repl.py

@@ -4,8 +4,10 @@
 import logging
 import os
 from typing import Annotated, Optional
+
 from langchain_core.tools import tool
 from langchain_experimental.utilities import PythonREPL
+
 from .decorators import log_io